I just started oil pulling. I have sinus problems, and at night I cough up so much mucus that it is difficult to sleep. I went on line to find help and found oil pulling. I kept trying to find side effects, and no one had any. The 3rd day after doing it 3 times a day for 20 minutes my mouth got extremely dry and sore, almost felt burned. I had been told by an alternative health doctor I was extremely toxic. I suppose it's trying to escape in the mucus. If you are, like I am I would try it for less than 20 minutes at first because my mouth was extremely sensitive to food and drink. I will just cut down on the time, but the benefits to my sinus and the lack of mucus was so dramatic that I won't give it up.